Personally, it makes a certain amount of sense to me that the inquisitor class is not as widely represented in the pony culture as others may be. While ponies share many of our own psychological traits, it should be remembered that they are also a prey species - and the active aggression of the inquisitor is not a stereotype most prey species have. Of course there are exceptions - they are sapient creatures, not just prey animals, and so are individuals whose heritage and experiences can shape them into an image that is very different from the rest of their kind. As was mentioned, the chaos hunters are a perfect example of this - as would particularly zealous loyalists of the empire.

Let me sleep through this time of pain,And grant me innocent dreams.Rouse me during the first summer rain,When all the world's at peace, it seems.